public DataTable am_Decode()        {            DataTable table = new DataTable();            string[] strAscDataList = Directory.GetFileSystemEntries(m_strFilePath);            foreach (string file in strAscDataList)            {                using (FileStream fs = File.OpenRead(file))                {                    HSSFWorkbook workbook = new HSSFWorkbook(fs);                    //获取excel的第一个sheet                    HSSFSheet sheet = (HSSFSheet)workbook.GetSheetAt(0);                    //获取sheet的首行                    HSSFRow headerRow = (HSSFRow)sheet.GetRow(0);                    //一行最后一个方格的编号 即总的列数                    int cellCount = headerRow.LastCellNum;                    for (int i = headerRow.FirstCellNum; i < cellCount; i++)                    {                        DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);                        table.Columns.Add(column);                    }                    //最后一列的标号  即总的行数                    int rowCount = sheet.LastRowNum;                    for (int i = 1; i <= sheet.LastRowNum; i++)                    {                        HSSFRow row = (HSSFRow)sheet.GetRow(i);                        DataRow dataRow = table.NewRow();                        for (int j = row.FirstCellNum; j < cellCount; j++)                        {                            if (row.GetCell(j) != null)                                dataRow[j] = row.GetCell(j).ToString();                        }                        table.Rows.Add(dataRow);                    }                }                File.Delete(file);            }            return table;        }